6718540690 has 16 divisors (see below), whose sum is σ = 12111904728. Its totient is φ = 2683298176.

The previous prime is 6718540679. The next prime is 6718540723. The reversal of 6718540690 is 960458176.

It can be written as a sum of positive squares in 4 ways, for example, as 6263614449 + 454926241 = 79143^2 + 21329^2 .

It is a super-2 number, since 2×6718540690² = 90277578006371352200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6718540690.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507907 + ... + 520966.

Almost surely, 2^6718540690 is an apocalyptic number.

6718540690 is a deficient number, since it is larger than the sum of its proper divisors (5393364038).

6718540690 is a wasteful number, since it uses less digits than its factorization.

6718540690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029533.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 6718540690 is about 81966.7047648007. The cubic root of 6718540690 is about 1886.9409834676.

The spelling of 6718540690 in words is "six billion, seven hundred eighteen million, five hundred forty thousand, six hundred ninety".